feat: 扩展天文计算能力
- 新增日食、月食、本地可见性、中心线、半影区域、SVG 图示与沙罗周期信息 - 新增行星冲合、留、方照、物理星历、视直径、相位、亮肢角、轨道节点等计算 - 新增木星伽利略卫星位置、现象与接触事件计算 - 新增恒星星表、星座判定、自行修正与观测辅助能力 - 新增 coord、formula、orbit、sundial、lite/sun、lite/moon 等扩展包 - 完善农历年号、月相英文别名、视差角、大气质量、折射、日晷与双星计算 - 增加 NASA、JPL Horizons、IMCCE 等回归测试数据与基线测试 - 重构基础算法文件组织,补充大量公开 API 注释和语义回归测试 - 更新中文和英文 README,补充示例、精度说明、SVG 配图
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package saturn
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import (
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"math"
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"testing"
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"time"
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)
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func TestRingNFullMatchesDefault(t *testing.T) {
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date := time.Date(2026, 4, 26, 9, 30, 45, 123456789, time.FixedZone("CST", 8*3600))
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got := Ring(date)
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want := RingN(date, -1)
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assertSameRingFloat(t, "EarthLatitude", got.EarthLatitude, want.EarthLatitude)
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assertSameRingFloat(t, "SunLatitude", got.SunLatitude, want.SunLatitude)
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assertSameRingFloat(t, "PositionAngle", got.PositionAngle, want.PositionAngle)
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assertSameRingFloat(t, "DeltaU", got.DeltaU, want.DeltaU)
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assertSameRingFloat(t, "MajorAxis", got.MajorAxis, want.MajorAxis)
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assertSameRingFloat(t, "MinorAxis", got.MinorAxis, want.MinorAxis)
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}
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func assertSameRingFloat(t *testing.T, name string, got, want float64) {
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t.Helper()
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if math.Float64bits(got) != math.Float64bits(want) {
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t.Fatalf("%s full-n mismatch: got %.18f want %.18f", name, got, want)
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}
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}
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